通过java代码来下载FTP地址中带中文的文件

/**
* ClassName:FtpUtils
*
* @author   Lishiguang
* @version
* @since    Ver 1.1
* @Date	 2013-2-27		上午11:27:03
*
* @see
*/
public class FtpUtils{

/**
* downFtpFileForUrl:(通过ftp url 下载ftp文件)
*
* @param ftpUrl
* @return 保存到本地的路径
* @throws Exception
*/
public static String downFtpFileForUrl(String ftpUrl)throws Exception {

String url = "", username = "", password = "", remotePath = "", fileName = "", localPath = "";
int port = 21;
// 截取FTP地址
final String ftpFlag = "ftp://";
if (ftpUrl != null && ftpUrl.length() > 0
&& ftpUrl.toLowerCase().contains(ftpFlag)) {
// 首先去掉FTP
final String cutedFtp = ftpUrl.substring(ftpUrl.indexOf(ftpFlag)
+ ftpFlag.length());
// 首先截取ip和端口
String ipAndPort = "";
if (cutedFtp.indexOf("/") != -1) {
ipAndPort = cutedFtp.substring(0, cutedFtp.indexOf("/"));
} else {
ipAndPort = cutedFtp;
}
// 开始获取ip和端口
if (!"".equals(ipAndPort)) {
if (ipAndPort.indexOf(":") != -1) {
url = ipAndPort.substring(0, ipAndPort.indexOf(":"));
String strPort = ipAndPort.substring(
ipAndPort.indexOf(":") + 1, ipAndPort.length());
if (strPort != null)
port = Integer.parseInt(strPort);
} else {
// 如果没有端口只获取IP
url = ipAndPort;
}
}

// 截取ftp文件路径和文件名
String fileNameAndPath = "";
if (cutedFtp.indexOf("/") != -1) {
fileNameAndPath = cutedFtp.substring(cutedFtp.indexOf("/") + 1,
cutedFtp.length());
} else {
fileNameAndPath = "";
}
// 开始获取ftp文件路径和文件名
if (!"".equals(ipAndPort)) {
if (fileNameAndPath.indexOf("/") != -1) {
remotePath = fileNameAndPath.substring(0,
fileNameAndPath.lastIndexOf("/"));
fileName = fileNameAndPath.substring(
fileNameAndPath.lastIndexOf("/") + 1,
fileNameAndPath.length());
} else {
fileName = fileNameAndPath;
}
}
// 获取本地上传路径
if (!"".equals(fileName)) {
localPath = Vutil.getFullFilePath(Constants.FTP_FILE_FLAG,fileName);
}

// 从配置文件中获取FTP账号密码
String userAndPass = "";
if (type != null && (type == 2 || type == 3)) {
userAndPass = Vutil
.getPropertieValueForLocal("group_ftp_user_password");
} else {
userAndPass = Vutil
.getPropertieValueForLocal("local_ftp_user_password");
}
// 开始截取FTP账号密码
if (!"".equals(userAndPass)) {
if (userAndPass.indexOf(":") != -1) {
username = userAndPass.substring(0,
userAndPass.indexOf(":"));
password = userAndPass.substring(
userAndPass.indexOf(":") + 1, userAndPass.length());
} else {
username = userAndPass;
password = username;
}
}
//开始下载文件
boolean isSuccess=downFtpFile(url, port, username, password, remotePath, fileName,
localPath);
if(isSuccess)
return localPath;
}
return "";
}

/**
* Description: 从FTP服务器下载文件
*
* @Version1.0
* @param url
*            FTP服务器hostname
* @param port
*            FTP服务器端口
* @param username
*            FTP登录账号
* @param password
*            FTP登录密码
*
* @param remotePath
*            FTP服务器上的相对路径
*
* @param fileName
*            要下载的文件名
* @param localPath
*            下载后保存到本地的路径
* @return
*/
public static boolean downFtpFile(String url, int port, String username,
String password, String remotePath, String fileName,
String localPath) {
boolean success = false;
FTPClient ftp = new FTPClient();
try {
int reply;
ftp.connect(url, port);
// 如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
ftp.login(username, password);// 登录
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
return success;
}
ftp.changeWorkingDirectory(remotePath);// 转移到FTP服务器目录
FTPFile[] fs = ftp.listFiles();
for (FTPFile ff : fs) {
String fname = new String(ff.getName().getBytes("iso-8859-1"),
"gbk");
if (fname.equals(fileName)) {
File localFile = new File(localPath);
OutputStream is = new FileOutputStream(localFile);
ftp.retrieveFile(ff.getName(), is);
is.close();
break;
}
}
ftp.logout();
success = true;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (ftp.isConnected()) {
try {
ftp.disconnect();
} catch (IOException ioe) {
}
}
}
return success;
}

public static void main(String[] args) {

final String ftpUrl = "ftp://192.168.0.111:21/test/aa/测试中文.doc";

try {
downFtpFileForUrl(ftpUrl);
} catch (Exception e) {
e.printStackTrace();
}

}
}